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Commite7bab08

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Further tweaking of the readfile() function in pg_ctl.

Don't leak a file descriptor if the file is empty or we can't read its size.Expect there to be a newline at the end of the last line, too. If thereisn't, ignore anything after the last newline. This makes it a tiny bitmore robust in case the file is appended to concurrently, so that we don'treturn the last line if it hasn't been fully written yet. And this makesthe code a bit less obscure, anyway. Per Tom Lane's suggestion.Backpatch to all supported branches.

1 parent623e49c commite7bab08Copy full SHA for e7bab08

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+11

-4

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src/bin/pg_ctl
- pg_ctl.c

1 file changed

+11

-4

lines changed

`‎src/bin/pg_ctl/pg_ctl.c`

Lines changed: 11 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -333,10 +333,14 @@ readfile(const char *path)`
`333`	`333`	`if (fd<0)`
`334`	`334`	`returnNULL;`
`335`	`335`	`if (fstat(fd,&statbuf)<0)`
	`336`	`+{`
	`337`	`+close(fd);`
`336`	`338`	`returnNULL;`
	`339`	`+}`
`337`	`340`	`if (statbuf.st_size==0)`
`338`	`341`	`{`
`339`	`342`	`/* empty file */`
	`343`	`+close(fd);`
`340`	`344`	`result= (char*)pg_malloc(sizeof(char));`
`341`	`345`	`*result=NULL;`
`342`	`346`	`returnresult;`
`@@ -352,14 +356,17 @@ readfile(const char *path)`
`352`	`356`	`returnNULL;`
`353`	`357`	`}`
`354`	`358`
`355`		`-/* count newlines */`
	`359`	`+/*`
	`360`	`+ * Count newlines. We expect there to be a newline after each full line,`
	`361`	`+ * including one at the end of file. If there isn't a newline at the end,`
	`362`	`+ * any characters after the last newline will be ignored.`
	`363`	`+ */`
`356`	`364`	`nlines=0;`
`357`		`-for (i=0;i<len-1;i++)`
	`365`	`+for (i=0;i<len;i++)`
`358`	`366`	`{`
`359`	`367`	`if (buffer[i]=='\n')`
`360`	`368`	`nlines++;`
`361`	`369`	`}`
`362`		`-nlines++;/* account for the last line */`
`363`	`370`
`364`	`371`	`/* set up the result buffer */`
`365`	`372`	`result= (char*)pg_malloc((nlines+1)sizeof(char*));`
`@@ -369,7 +376,7 @@ readfile(const char *path)`
`369`	`376`	`n=0;`
`370`	`377`	`for (i=0;i<len;i++)`
`371`	`378`	`{`
`372`		`-if (buffer[i]=='\n'\|\|i==len-1)`
	`379`	`+if (buffer[i]=='\n')`
`373`	`380`	`{`
`374`	`381`	`intslen=&buffer[i]-linebegin+1;`
`375`	`382`	`char*linebuf=pg_malloc(slen+1);`

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`‎src/bin/pg_ctl/pg_ctl.c`

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